Method of producing welts



July 3, 1945. I WQRM METHOD OF PRODUCING WELTS Filed Nov. 29, 1940 5 Sheets- Sheet 1 fm ema/a Clscar- Worm. B; Ma, ffi/m 42a July 3, 1945. Q; WORM METHOD OF PRODUCING WEL'IS Filed Nov. 29, 1940 3 Sheets-Sheet 2 July 3, 1945. o, W M 23,79,773

- METHOD OF PRODUCING WELTS Fi led Ndv. 29, 1940 s Sheets-Sheet 3 [/7 yen for." 05 car Fl ohm.

Patented july 3, 1945 1 "Oscar Wo rrn ChelnnitavGermany; vested in the,

Alie n l iftiperty Custodian Application November 29, 1940, Serial No. 367,846 a l 1 ,InvGermany October 31,1938 I i A i r i The present inventionrelates to a method of I producing upon a fuli fashioned flat knitting; ma chine, welts the sinker loops of the beginning auxiliary'barsareemployed; i

edge of which areftransferred to each second frame needleonly. The invention also relates to a device for carrying out the new methodfi According to a known proposal "each offthe loops each composed of two 'juxta-positioned I loops ispicked up by two horizontally reciprocable welt hooks or welt points to provide sufficient space for the frame needles which for the" purpose oftransferring the loops dip from below into said loops held spread open.

Due to distortions of the fabric occurring particularlyat the edge'portion of same at which dipping of the frame needles free'of disturbance is impossible, auxiliary bars are used for straightening the fabric spectively. I 3 Except the use ofspecial auxiliary bars the drive and arrangement of which cause certain difficulties, further special oscillating movements of the welt hooks are required for releasing the latter after picking effected.

or the loops to be dipped reup of the loopshas been with Jacquard lace machines narrowingbars fully coveredwith narrowin points without additional Proposals havealready been made to the effect that after sinking a first row of loops and be forepickingup this row of loops bywthe welt According to the method proposed by the inthat first allsinker loops in all I divisions are picked up bybars fully provided with-welt hooks,

whereupon each second needle loop is tickled off and cast oiT by coveringpoirlts present inthe machine, whereby, upon each two adjacent welt hooks, common loops are formed into which, for the purpose of closing the welt, dipthe c0V- forming the welt has been produced whereby the beginning row is picked up jby the covering points to betickled off, after release has been effected, upon each second frame I needle, by a return movement of the welt hooks. The Welt: hooks hereby are horizontallymoved-away from and towards the frameneedles'without the welt bars performing oscillating movements or a1ateral rack.

For carrying out themethod according tothe invention a device, forming part of the invention, is used which consists in this that foreach division awelt bar is provided carrying welt hooks, coordinated to each frame needle, which hooks are bent or inclined towards each other in pairs and are arranged in alower level than olfsetjshoulders of said welt hooks upon which due to'the take up effector" the wltfrodspiare shifted the sinker loops to be tickled oir upon the frame 1 needlesfbyj the covering points'thereby closing It is of importance that either the picot bar-a1- ready present in the machine is used which must be provided with covering points coordinated to each second frame needle or that in connection vention these drawbacks are obviatedby the fact I comb each second frame needleofa fiat knitting machine iSGfiillSEd not to take-up thread and then the welt bar provided with bearded needles is-caused to seize thelargesinker loops obtained in this manner in such a wash: that always a sinker loop isheldby two welt bar needles. This method in so far is uncertain as free loop'smust be caught which easily may be, distorted.

Moreover} a device has become known for transferring welts upon fiat knitting macl'iines inwhich covering points areused forthe purpose of closing a Weltby a closing row producedwith allneedles; These additional covering points are arranged in a bar below the beginningwelt jab ric. By oscillating the bars bymeans of special toothed segments all of the sinker loops. of the beginning row are; picked up and transferred upon the frame needles by lateral rack for half This rather complicated lmachineQ however, cannot be used for carrying outthe method ac? cordingto the invention. i

Welt *bars'provided with welt hooks: orwelt points belongingto each other and arrange'din pairs also are known already. According to one construction of such welt "bars one of these Welt hooks always serves for picking up each second sinker loop, whereas the other welthook serves for spreadingthe sinker loop picked'upfi According to another construction of such welt bars both welt hooks are used for picking spreading eachsinker loop. i

In both cases pairs ofthe Welt hooksresiliently abut against each other to all-ow lrnovement of the frame needles out of the range of l the welt needles which from belowid ip into the spread loopsfor the purpose of closing the welt.

vention is shown by way of example.

I of themanufacture of awelt, 60

As has already been describedfor another proposal, in this case also dipping'of the frame needles freeof disturbance into the loops ofythe fabric, particularly the loops of thehedge -pore 'tions, is impossible owing tof-distortion "of the fabric. a 1 a I In the accompanying drawings a device for carrying, out the method according to the In these drawings:

Fig. l, is ayside elevation of the 'device accorda ing to the invention,

Fig. 2 shows a planview of welt-hooks, r

Fig. 3 isa loop diagram showing thebjeg ning a portion of the Fig. 4 is a side elevation showing the position up and tickled off upon the frame needles.

than the shoulders 9 as well as owing tothe bending oil or chamfering of the said hooks, the latter are brought out of the range of the loops without hindrance and thereupon the loops carried by the covering points are automatically A lateral rack of the welt bar is not required in this case.

What'I claim is: 1. Amethod of producing, upon a flat knitting machine, welts the sinker loops of the beginning edge of which are transferred to each second showing the latter in the lowermost position shortly before the return movement of the welt hooks, and

Fig. 8 is a side elevation showing the tickling ofiposition of the covering points relatively to the frame needles, the welt hooks being horizontally returned out ofthe range of the loops. In the knitting; machine according. to the invention the frame needles 1, the knocking over bits 2, the jack sinkers 3 and the covering points 4 are arranged in a well known manner. Upon the operating table of the machine horizontal guides 5 are arranged for each division upon which welt bars 6 may be shifted. The latter are provided with welt hooks l, 8 coordinated to each frame needle. The welt hooks l, 8 have a shoulder 9 which is arranged in rear of the hook portion 8 in a somewhat higher level than the latter. The shoulder Q may have any desired shape and be provided for instance with an, edge arranged vertically or obliquely to the.

frame needles. The hooks 1-, 8: either are bent ofi laterally to eachother,. as shown. in- Fig. 2, or are inclined towards each. other only without projecting laterally. I0 represents. the fabric forming. the welt.

After formation of the, beginning row all the sinker loops are picked up by the welt-hooks 1, 8. Then by taking up and casting oif theloop of eachsecond frame needle corresponding. to

the welt intowhich the draw ofi rods are inserted, the welt hooks are moved in the. direction of the arrow y towards the frame. needles as may be seen from Fig. 5. Hereby the. loops of the beginning: row lying. upon. each two: adjacent welt v hooks are shifted uponthe shoulders B arranged in rear of the hooks in ahigher level than the latter. If: the welt bar is returned far enough v for the welt hooks carried by same being moved beyondthe plane of the frameneedles, dipping of: the covering points. 4 into the loops of: the beginning row (Fig. 6.) causes-picking up.- of. these loops. by said covering points.

As soon-as thecoveringpoints. reach their lowermost position shown in Fig. 8 the welt hooks are returned in the direction of thearrow 2: (Fig. 8). whereupon the covering. points 4, together with the frame needles I. risein. a well known manner for transferring theloopsof the beginningrow upon the frame-needlesfor.the-purpose of closing the welt.

The welt. baris moved inbothdirectionsxin a horizontal plane only without performing rack on oscillating movements. v

Owing to the-hooks their-1g, arranged. lower frame needle only by means of horizontally reciprocating welt hooks, the steps of picking up all sinker loops in all divisions by bars fully provided" with welt hooks, and then tickling off and casting all each second needle loop by covering P ints present in the machine, whereby common loops are formed upon each two adjacent welt hooks into which, for the purpose of closing the welt, dip the covering points after producing a sufficient length of the welt fabric, the beginning row being picked upby said covering pointstobe tickled. off after release has been effected upon ach second frame needle by return movementof said Welt hooks. l p 2. A device for producing upon a flat knitting machine, welts the sinker loops of the beginning edge of which are transferred to each second frame needle only by means. of horizontally. reciproeating'welt hooks, comprising a welt bar for each division carrying welt hooks coordinated to each frame needle for pickingup loops, saidhooks being bent towards each other in pairs and arranged in a lower level than offset shouldersof said welt hooks upon which, due to the take up effect of the welt rods,.the sinker loops are shifted for being picked up and. tickled oil" by covering points upon said frame needles for the purpose of closing the welt.

3. A device as set forth in claim 2, comprising awelt bar for each division carrying welt hooks coordinated to each frame needle for pickingnp.

loops, said hooks being. chamfered towards each other in pairs and arranged in a lower level than offset shoulders of. said Welt hooks upon which, due to the take up effect of the welt rods,,tlie sinker loops are shifted for being picked up and tickled off by covering points upon said frame needles for the purpose of closing the welt.

4. A method of knitting. welts on a full fashioned knitting machine, which comprises the formation of afirstcourse from a strand held by all the. needles and by the corresponding hooksof the welt bar, transferring the loops of. said first course from alternate needles to covering points,

releasing. the loops from the covering points while retaining the loops on the intermediate needles and the welt hooks, whereby each pair of loops between adjacent needles will be formed int'o'an enlarged loop engaged by a pair of adjacent welt hooks, forming succeeding courses onto said first course, releasing, said enlarged loops of the first 

